On Tue, Jan 02, 2024 at 03:38:10PM +0800, Ming Lei wrote: > On Tue, Dec 19, 2023 at 9:28 AM Ming Lei <ming.lei@xxxxxxxxxx> wrote: > > > > blkg_lookup() is called with either queue_lock or rcu read lock, so > > use rcu_dereference_check(lockdep_is_held(&q->queue_lock)) for > > retrieving 'blkg', which way models the check exactly for covering > > queue lock or rcu read lock. > > > > Fix lockdep warning of "block/blk-cgroup.h:254 suspicious rcu_dereference_check() usage!" > > from blkg_lookup(). > > > > Tested-by: Changhui Zhong <czhong@xxxxxxxxxx> > > Signed-off-by: Ming Lei <ming.lei@xxxxxxxxxx> Acked-by: Tejun Heo <tj@xxxxxxxxxx> Thanks. -- tejun
